Method of die forming articles from sulphurized paper board



Oct. 18, 1932. A. ABRAMS 1,882,683

METHOD OF DIE FORMING ARTICLES FROM SULPHURIZED PAPER BOARD Filed June 5, 1929 Patented Oct. 18, 1932 UNIT an STAT-ES PATENT/OFFICE" ALLEN .ABRAMS; or" WAUSAU,WISCO1\TSIN, ASSIGNOR v'Io MARATHON rArERM-ILLs coMrA Y, or ROTHSCHILD, WISCONSIN, A. CORPORATION or wIscoNsIN METHOD OF DIE FORMING ARTICLES SULPHURIZ ED.PAPER BOARD Application filed June 3 1929. Serial No'. 368,001..

This invention'relates to a method of and apparatus for" die forming commercial articles, such as containers, from sulphurized paper board and like material.

An object of this invention is to provide a method of forming shaped articles from sulphurized paper board and the like.

Another object of the invention is to provide a methodof forming or drawing shaped articles fromsulphurized paper board an the like by means of dies.

A further object of the invention is to provide an apparatus for die forming articles from sulphurized paper board and the like.

The above, other and further objects of the invention will be apparent from the following description, accompanying drawing, and appended claims.

According to the invention the, method consists in die drawing sulphurized paper board in the presence or" heat at such a temperature as not to cause the sulphur in the paper to melt substantially and come to the surface of the paper and form an uneven and rough surface, or stick to the die members. I I

The apparatus of the invention comprises male and female forming dies, oneof which is heated for the purpose of subj ecting' sul: p-hurized board and the like to heatdur ng the drawing operation, the other die taking its heat from the heated die or being also direct-f ly'heated.

Theaccoinpanying drawing illustrates one embodiment ofthe apparatus capable of being used in'practicing the method.

The views of the drawing areas follows: Figure 1 is a sectional view taken substantially on the broken linell of Figure 5.

Figure 2 is a fragmentary sectional view of a portion of the maledie showing a thermometer inserted in the same. p

F igure 8 is afragmentary sectional view of a portion of the female die showing .a

. thermometer inserted in, the lower part of the die.

Figures is a top, plan view of a finished articleformed from sulphurized board'by the method and apparatus of this invention. Figure 5 is a sectional view taken substantially on line V-V of F igure 1.

there are four shownin the drawing.

Fi ure 6 is a verticalsection taken on line VI- I of Figure4.-

F igure'? is a fragmental sectional view of a mometer arranged to take external temperatures of the die. 1

Theform of apparatus illustrated in the drawing is for the purpose of explanation of the invention and the invention is not to be construed as limited to an apparatus made strictly in accordance with the illustrated form of the same. i p

. The illustrated form of the apparatus comprises a male die 1 and a female die 2which in the present instance are shaped to form fini'shed articles like that shown in Figures 4 and 6'ofthe drawing.

portion of the female die showing a ther- A female die block 3 is supported in the usual manner on the bed of a press and is flanged at 4 whereby the same maybe secured to the bed plate of the press.

Guide posts 5 are secured intheflange 4 of the base plate 3 and extend upwardly forguiding the male die carrying. member 6 which is, shown as flanged at 7 and provided with apertures 8 for the guide pins 5, whereby the plate 6 may have proper movement during the drawing or forming operations.

. The plates 3 and 6 may be made of any metal such .as cast iron and the same are faced by hardened steel. The plate or member 6 has a hardened steel ring member 9 heldtherein by screws 10, while the female die 2 "is made as a circular wall having a lateralfiange 11 through which screws 12.

passto fasten the same to the base plateB.

The several parts, of, course, are shaped to form the desired'finished article, such as that shownin Figure 4 ofthe drawing, v The male die moves "within; the member 9 under influence'of the mechanism of the press, while the male die member 6 is reciprocated in a manner well understood.

The male die 1 is provided with a plurality of axially extendingapertures 13, of which In said apertures 13are placed heating elements 14, which may be coiled resistance wire supplied with suitable electric current, or any other suitable heating elements.

The heatby means of; cement or other adherent material 21 to the outside of the female die memher 3 for observing the temperature of the female die. v

A stripping plate 22 is arranged within the female die and is actuated in a well-known manner for's'tripping the finished article fromthe female die. 7 I V The female die plate 3 is likewise adapted .to be heated by means of elements 25 extending radially toward the center thereof and connected by means of wires 26 to a source of electrical energy. 2

he drawing of finishedarticles from sulphurized paper and the like depends 011 sev eral conditions, including the control of time, temperature-and moisture of the sheet. The proper combination of these factors results in successful drawing, or forming by means 7 of dies, of sulphurized board and the like.

The several thermometers 17, 19 and 20 have been indicated respectively as X-position, Y-position and Z-position, the X position indicating the inside temperature of the male die, the Y-position indicating the inside temperature of the female die, and the Z-position the outside temperature of the female die. It is of course possiblet'o'use more thermometers if occasion demands, and if it were believed necessary'to more fully ascertain the temperatures of the various parts of the apparatus.

The preformed sulphuri zed board or blanks of'the sameto be drawn are moistened slightly, the amount of moisture'runnin g fromfi to 8 pounds per thousand square feet. of paper or board. As here illustrated,fa moistened circular blank, at room or other ordinary temperature, is inserted in the press andthe mechanism actuated, whereupon. the male-die carrying member 6 and the accompanying male die 1 is caused to descend, with'the member 6 stopping when the same reaches the female die and the male die 1 continuing its downward movement to form or draw the sheet into whatever is theshape of the male and "the female dies. The time of drawing must necessarily be short and also'the tem- 'iper'a'tnre involved must .bes'uch as not to melt the sulphur n the paper or board to such a degree that the. same will come to the v surface of the board and there crystallize, or

stick to the die members. Incioient melting of the sulphur must occur to permit satis-- factory drawing of the article in the die, but the conditions of time and temperature are so controlled that undue or excessive melting of the sulphur is prevented.

It has been ascertained from a long series of experiments that articles suchas shown in Figure 4 of the drawing, which is a lid for an ice-cream container, may be successfully drawn within a temperature range of from about 235 to'about 275 F., as measured in the hottest parts of the dies. The most successful results have been obtained with the temperature in the hottest parts of the die running from 260 to27 0 F. This temperature is suflicient to soften the sulphur to a degree to allow forming or drawing of the sheets without causing the sulphur to come to the surface and there crystallize and make an objectionable surface on the finished article. .1

Temperatures observed from some of these ex'perlm'ents' at the several thermometers follow:

Female die I Female die Male die outside temp; inside temp. inside temp.

Mark Z Mark Mark X F. 9F. F. 215 266 260 22 271 265 190 241 235 Lids for ice crea'n'i containers, such ashlustrated in Figure 4,- have been successfully made in accordance with this invention using an apparatus similar to that shown in the drawing, wherein a temperature of 200 F. was observed on bottom. (female) die at mark-Z with the forming operation continuing for approximately 12 seconds.

This invention is not only'a forming operation but a-lsoa drawing operation. A relativ'elyde'ep flange, such as the margin flange '23 of the 'lidf(Figure 4:) [can besatisfaeto'rily produced without cracking -by using my method.

2. A method of die forming articles from sulphurized board and the like which compris'es forming and drawing a moistened blank 'of-said board in dies in the presence of heat, timing the draw and controlling the heat and'moisture content toperinit'i'ncipient melting of the sulphur without drawing the sulphur to the surface of the board.

3. A method of die forming a deeply:

flanged cover or like article from sulphurized fiber board, which comprises subjecting a blank of sulphurized fiber board under heat and pressure to a forming and drawing action between interfitting cylindrical male and female die members, the temperature to which the sulphurized fiber board is subjected being so regulated as to cause incipient melting of the sulphur without causing excessive flow of sulphur to the surface.

4. A method of die forming articles from sulphurized board and the like, which comprises moistening the board and then form-c ing and drawing the same between heated male and female die members, maintaining the surfaces of said die members at a temperature slightly. above the melting point of sulphur, and completing said forming and drawing operation before the sulphur of said sulphurized board has completely melted.

5. A method of die forming articles from sulphurized board and the like, which comprises moistening the board and then forming and drawing the same between heated male and female die members to produce arelatively steep marginal flange on the article being formed, maintaining the surfaces of said die members at substantially the melting point of sulphur, and completing said forming and drawing operation before the sulphur of said sulphurized board has com- 1 pletely melted.

In testimony whereof I have hereunto subscribed my name at Rothschild, Marathon County, Wisconsin.

ALLEN ABRAMS. 

